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Investigating new activators for small-bandgap LaX3 (X = Br, I) scintillators

Journal Article · · Journal of Crystal Growth
 [1];  [2];  [3];  [4];  [4];  [5];  [3];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center and Department of Materials Science and Engineering; UC Berkeley
  2. Univ. of Tennessee, Knoxville, TN (United States). Department of Materials Science and Engineering
  3. Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center, Department of Materials Science and Engineering and Bredesen Center
  4. Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center and Department of Materials Science and Engineering
  5. Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center
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In this study, luminescence and scintillation properties of Bi3+, Sb3+, and Eu2+-doped LaI3 and LaBr3 were explored. Out of the three dopants investigated, Eu2+ was the most promising new activator for small-bandgap LaX3 (X = Br, I) and was further studied in the mixed-halide LaBr3-xIx. Crystals were grown from the melt using the vertical Bridgman method. LaBr3:Eu2+ 0.5% (mol) had the most favorable scintillation properties with a light output of 43,000 ph/MeV and 6% energy resolution at 662 keV. Performance of LaBr3-xIx:Eu2+ worsened for most samples as iodide concentration was increased. Finally, room-temperature scintillation of LaI3:Eu2+ 0.1% and 0.5% was observed and is the first case of room-temperature emission reported for doped LaI3.
Research Organization:
Nuclear Science and Security Consortium, Berkeley, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
Grant/Contract Number:
NA0003180
OSTI ID:
1477492
Alternate ID(s):
OSTI ID: 1576615
Journal Information:
Journal of Crystal Growth, Journal Name: Journal of Crystal Growth Journal Issue: C Vol. 483; ISSN 0022-0248
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
A1. Characterization
A2. Bridgman technique
A2. Growth from melt
B1. Halides
B1. Rare earth compounds
B3. Scintillators